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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d10144d9332476e1d51407f591ba535537b8f2db6dd1bc4b20953411d3fb5e' 
  AND token = 'TcBaxeWhQNYIbG7MP2enSslTQ7+eGfNkdRVfRmEcecU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}